What's the difference between shunless and sunless?

Shunless

Definition:

• (a.) Not to be shunned; inevitable; unavoidable.

Example Sentences:

Sunless

Definition:

• (a.) Destitute or deprived of the sun or its rays; shaded; shadowed.

Example Sentences:

• (1) Dihydroxyacetone-containing sunless or self-tanning topical preparations are enjoying a resurgence of use in recent years.
• (2) The surgical masks being distributed across the nation will do almost nothing to protect those living in a sunless smog.